Fire extinguisher head assembly



FIG. 1 is a front elevational view of a fire extinguisher head assembly showing my design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a fire extinguisher head assembly, as shown. 